audioOS 9.9.15.5.1

audioOS 9.9.15.5.1 (build 19L580) is an official Apple over-the-air update for the HomePod (Unknown Model), released on 2022-05-25T17:17:03Z. The update package is 183.23 MB. This is a delta (partial) update that requires 15.4.1 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is 15c12db291ca6dc33f9dbd794787dedca9aff98f.zip.